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Rational Route for Increasing Intercalation Capacity of Hard Carbons as Sodium-Ion Battery Anodes.
ChemSusChem ( IF 8.4 ) Pub Date : 2020-09-17 , DOI: 10.1002/cssc.202001837
Yuto Katsuyama 1 , Yuta Nakayasu 1, 2 , Hiroaki Kobayashi 3 , Yasuto Goto 1 , Itaru Honma 3 , Masaru Watanabe 1
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Hard carbon (HC) is the most promising candidate for sodium‐ion battery anode materials. Several material properties such as intensity ratio of the Raman spectrum, lateral size of HC crystallite (La), and interlayer distance (d002) have been discussed as factors affecting anode performance. However, these factors do not reflect the bulk property of the Na+ intercalation reaction directly, since Raman analysis has high surface sensitivity and La and d002 provide only one‐dimensional crystalline information. Herein, it was proposed that the crystallite interlayer area (Ai) defined using La, d002, and stacking height (Lc) governs Na+ intercalation behavior of various HCs. It was revealed that various wood‐derived HCs exhibited the similar total capacity of approximately 250 mAh g−1, whereas the Na+ intercalation capacity (Ci) was proportional to Ai with the correlation coefficient of R2=0.94. The evaluation factor of Ai was also adaptable to previous reports and strongly correlated with their Ci, indicating that Ai is more widely adaptable than the conventional evaluation methods.

中文翻译:

增加硬碳作为钠离子电池阳极的嵌入容量的合理途径。

硬碳(HC)是钠离子电池负极材料的最有希望的候选者。作为影响阳极性能的因素,已经讨论了几种材料特性,例如拉曼光谱的强度比,HC微晶的横向尺寸(L a)和层间距离(d 002)。然而,这些因素不反映Na组成的整体性质+直接嵌入反应,由于拉曼分析具有高的表面灵敏度和大号一个d 002仅提供一维的结晶的信息。在此,提出使用L a定义的微晶夹层面积(A i)。d 002和堆积高度(L c)控制着各种HC的Na +嵌入行为。结果表明,各种木材来源的HC表现出相似的总容量,约为250 mAh g -1,而Na +嵌入容量(C i)与A i成正比,相关系数R 2 = 0.94。A i的评估因子也适用于以前的报告,并且与它们的C i高度相关,表明A i 比常规评估方法具有更广泛的适应性。
更新日期:2020-11-09
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